JP2706544B2 - Ballast for electronic discharge lamp - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ballast for an electronic discharge lamp for lighting a fluorescent lamp or the like by an inverter lighting method.

[Prior Art] This type of ballast is an inverter oscillation circuit that controls on / off of a transistor and a high frequency generated by an inverter transformer to light a discharge lamp connected to an output terminal of the inverter transformer. Therefore, it is generally called an electronic ballast.

Conventional examples of this electronic ballast are shown in FIGS. 4 and 5. The ballast case indicated by reference numeral 1 in FIG. 4 has a rectangular cylindrical shape with both ends opened, and a case body. 2 and a case lid 3. Case body 2
Are fixed to the inner surface of the chassis of the lighting fixture (not shown) through fixing parts (not shown) passing through through holes 12 (only one is shown in FIG. 5) provided at both ends in the longitudinal direction of the main plate portion 2a. You. The case lid 3 is detachable from the case body 2, and the both side plates 3 a are arranged on the outer surfaces of both side plates 2 b of the case body 2 in a slightly elastically deformed state. A locking projection 4 bulging out of the side plate portion 3a is hooked into a locking hole 4 of the side plate portion 2b.
And the case cover 3 are connected to each other so that the ballast case 1 can be assembled.

A heat radiating plate 6 is screwed to one side plate 2b of the case main body 2, and a printed wiring board 7 arranged in parallel with the main plate 2a of the case main body 2 is screwed to the heat radiating plate 6. Various electric components 8 necessary as an electronic ballast are mounted on one surface of the printed wiring board 7 on the case lid 3 side, and terminal blocks 9 and 10 are mounted on both ends of the one surface. Have been. Reference numeral 11 denotes a switching transistor included in the inverter oscillation circuit, which is a kind of the electric component 8,
Is closely related to

The terminal blocks 9 and 10 have lead wire insertion ports 9a and 10a on the end surface on the side of the case lid 3, and a self-locking terminal is provided inside the lead wires connected to the insertion ports 9a and 10a. A vertically long structure incorporating a metal fitting (not shown) is used. The terminal block 9 arranged at one end of the printed wiring board 7 is used for power supply connection, and the terminal block 10 arranged at the other end of the board 7 is used for wiring inside the device.

Wiring for the electronic ballast is performed at a lighting fixture installation site in a state where the electronic ballast is mounted on a chassis of the lighting fixture disposed on a ceiling or the like.

Therefore, in the wiring work, first, the case cover 3 is removed from the case body 2 and various lead wires (not shown) for power supply and feed are connected to the lead wire insertion holes 9a and 10a of the terminal blocks 9 and 10. The case lid 3 is inserted upward from directly below, and then the case lid 3 is fitted and attached to the case main body 2.

[Problems to be Solved by the Invention] However, in the configuration of the conventional ballast for an electronic discharge lamp, vertically long terminal blocks 9 and 10 are arranged along the thickness direction of the ballast case 1, and lead wires are provided from the lower surface thereof. Plug in and connect
The insertion end portions of the lead wires are located below the terminal blocks 9 and 10 and are wired in the ballast case. Therefore, the space in the height direction based on the wiring space of the lead wire is
Need below 9,10.

Since the required space and the height of the terminal blocks 9 and 10 are along the thickness direction of the ballast for the electronic discharge lamp, the conventional ballast for the electronic discharge lamp has a large thickness and the thickness is reduced. It was difficult. In a lighting fixture using a ballast for an electronic discharge lamp having such a large thickness, the ballast is one of the factors that hinder the thinning of the fixture.

In addition, the wiring work of the lead wires to the conventional ballast for an electronic discharge lamp is troublesome because it is necessary to perform the operation of attaching and detaching the case lid as described above.

SUMMARY OF THE INVENTION An object of the present invention is to provide a ballast for an electronic discharge lamp which can facilitate the work of wiring lead wires and can reduce the thickness.

[Means for Solving the Problems] In order to achieve the above object, in a ballast for an electronic discharge lamp according to the present invention, a case body having side plate portions on both side edges of a main plate portion; Each has a side plate on the edge,
A case lid body that is connected by superposing these side plate parts on the side plate part of the case main body, and the case main body and the case lid are provided at both ends of a cylindrical ballast case having both ends opened by the case main body and the case lid body. A self-locking type, which is disposed between the main plate portions of the body and has a lead wire insertion port at an end exposed at both ends of the ballast case, and a lead wire inserted through the insertion port is connected. A terminal block in which the terminal fittings are incorporated, a board fixing portion formed at a portion of the terminal block opposite to the end portion, and at an intermediate position in the height direction of the terminal block, and an end at the board fixing portion. Parts are connected between the two terminal blocks, and the printed circuit board is electrically connected to the terminal fittings. The printed circuit board is positioned within the height of the terminal block and attached to the printed circuit board. Various electrical parts It is those provided with the door.

[Operation] In the ballast for an electronic discharge lamp according to the present invention, the terminal block provided at the end of the ballast case has a lead wire insertion port at the end exposed at both ends of the ballast case. Therefore, the operation of inserting the lead wires into the above-mentioned insertion ports at both ends in the longitudinal direction of the ballast case can perform the wiring work of the lead wires to the ballast. There is no need to put on and take off the body.

By the above-described wiring of the lead wire, the insertion end side portion of the lead wire is not wired in the ballast case.

In addition, since the end of the printed wiring board is fixed to the board fixing portion formed on the terminal block, the printed wiring board is supported at an intermediate position in the height direction of the terminal block, and the printed circuit board is supported by the case body and the case lid. It can be provided separately from the main plate portion. The space secured between the main plate portion and the printed wiring board in this manner is provided within the height of the terminal block, and is used as a space for accommodating lead terminals and the like of electric components mounted on the printed wiring board. Is done.

In addition, since various electrical components are located within the height of the terminal block and attached to the printed wiring board, the thickness of the entire ballast is reduced to the height of the terminal block by the main plate of the case body and case lid. The size can be made to include the thickness dimension.

Embodiment One embodiment of the present invention will be described below with reference to FIGS.

In the drawing, reference numeral 21 denotes a ballast case made of a sheet metal having a substantially rectangular cylindrical shape with both ends opened, and is formed of a case body 22 and a case lid 23.

The case body 22 is provided with the plate portions 22a on both side edges of the main plate portion 22a.
Each has a side plate portion 22b extending in a direction orthogonal to the section, and has a U-shaped cross section. The case main body 22 has fixing holes 24 at both ends in the longitudinal direction thereof. The case main body 22 is attached to a lighting fixture chassis (not shown) through fixing tools such as screws (not shown) passing through the fixing holes 24. It is supposed to be. The lighting fixture is mounted on the ceiling, and is, for example, a ceiling-mounted fluorescent lighting fixture.

The case lid 23 is also provided on both side edges of the main plate 23a.
Each has a side plate portion 23b extending in a direction orthogonal to the above, and has a U-shaped cross section. Then, the side plate 23b of the case lid 23
Are overlapped so as to be in close contact with the outer surface of the side plate portion 22b of the case main body 22 by their elastic force.
b, 23b comrades are connected. This connection is made by hooking a plurality of hooking projections 25 formed on the side plate 23b into a plurality of hooking holes 26 formed on the side plate 22b (see FIG. 1).

At one end in the longitudinal direction of the ballast case 21, a terminal block 27 that is sandwiched between the main plate portions 22a and 23a and closes one end opening of the case 21 is disposed, and a ballast case is provided.
At the other end in the longitudinal direction of 21, a terminal block 28 that is sandwiched between the main plate portions 22 a and 23 a and closes the opening at the other end of the case 21 is arranged.

On the upper and lower surfaces of each of the terminal blocks 27 and 28, which are in contact with the main plate portions 22a and 23a, a pair of engaging projections 29 are integrally provided, respectively.
These projections 29 are fitted into engagement holes 30 formed in the main plate portions 22a, 23a and toward the side plate portions 22b, 23b (see FIG. 1). By these fittings, each of the terminal blocks 27 and 28 is positioned at the end of the ballast case 21 and fixed so as not to come off.

Each terminal block 27, 28 is connected to ballast case 2 as shown in FIG.
A lead wire insertion port 31 is provided on an end face exposed to the one end opening, and a terminal fitting 32 to which a lead wire (not shown) inserted through the insertion port 31 is connected is incorporated. The terminal fitting 32 is of a self-locking type, and a lead terminal portion 32 for connection to a printed wiring board 34 described later is provided on a part of the fitting 32.
a is provided.

One terminal block 27 is used for power supply connection, and a total of six lead wire insertion ports 31 for power supply wiring, power supply wiring, ground wiring and its supply wiring, and It has terminal fittings 32. Similarly, the other terminal block 28 has a total of two lead wire insertion ports 31 and terminal fittings 32 for wiring in the instrument, that is, a lead wire to be inserted into a lamp socket or the like.

Each of the terminal blocks 27 and 28 has a substrate fixing portion 33 at a portion opposite to the end surface where the lead wire insertion port 31 is opened. The fixing portion 33 is provided at an intermediate position in the height direction of the terminal blocks 27 and 28, and in the case of the present embodiment, is formed by a step portion provided apart from the main plate portion 23a of the case lid 23. . The lead terminal portion 32a protrudes from the substrate fixing portion 33 toward the main plate portion 23a.

A printed wiring board 34 is provided between the terminal blocks 27 and 28, and both ends in the longitudinal direction are connected to the board fixing portions 33 of the terminal blocks 27 and 28, respectively, in parallel with the main plate portions 22a and 23a. It is erected. The connection between the board 34 and the board fixing portion 33 is made by connecting holes 35 provided at both ends in the longitudinal direction of the printed wiring board 34.
Then, after the lead terminal portions 32a of the terminal blocks 27 and 28 are inserted, the lead terminal portions 32a are soldered to the printed wiring board 34 at the insertion portions. Since the connection holes 35 are formed in the lands of the wiring pattern (not shown) of the printed wiring board 34, the above connection also makes the electrical connection between the terminal fitting 32 and the wiring pattern at the same time.

In FIGS. 2 and 3, reference numeral 42 denotes a receiving portion formed on the side plate portion 22b of the case main body 22 so as to bulge toward the inner surface side.
This supports the edge of the printed wiring board 34.

The ballast is assembled by positioning the terminal blocks 28, 28 from above at both ends of the case main body 22 arranged with the main plate 22a as the bottom, and then disposing the printed wiring board 34 on which electric components described later are mounted. At the same time, both ends are placed on the substrate fixing portion 33, and at the same time, the lead terminal portions 32a are inserted into the connection holes 35, then the lead terminal portions 32a are soldered to the printed wiring board 34, and finally, the case Case lid from above
By fitting them so as to cover them and connecting them to form the ballast case 21, they can be assembled without using special connecting parts such as screws.

Various electric components required as an electronic ballast and a heat sink 36 are attached to the printed wiring board 34. The electrical components include various electrical components that form a rectified power supply circuit,
Various electric components forming a starting circuit of the inverter oscillation circuit, various electric components forming the inverter oscillation circuit, and various electric components forming a protection circuit of the inverter oscillation circuit are used.

These electric components and the like are provided within the height dimension X of the terminal blocks 27 and 28. Therefore, the electric component 3 having the lead terminal 37a and having a relatively large height
7 is inserted into the printed wiring board 34 from the case body 22 side, and a surface-mounted electrical component 38 having a small height is surface-mounted on the printed wiring board 34 on the surface of the case lid 23 side. An electric component (that is, an inverter transformer) 39 having the largest height is passed through a through hole 34a provided in the printed wiring board 34, and is disposed between the main plate portions 22a and 23a.

The insulated switching transistor 37A provided in the inverter oscillation circuit is a type of the electric component 37, and a screw 40 inserted from the case lid 23 side of the printed wiring board 34 is penetrated therethrough. The heat sink 36 is screwed to the tip of the screw 40. Therefore, the heat sink
36 is closely connected to the switching transistor 37A.
The other portion of the heat radiating plate 36 is in close contact with the main plate portion 22a of the case main body 22, so that the heat of the transistor 37A is radiated to the case main body 22.

In the drawing, reference numeral 41 denotes an elastic body such as synthetic rubber, which is positioned on the printed wiring board 34 and is sandwiched between the board 34 and the case lid 23.

The ballast for an electronic discharge lamp having the above configuration is mounted on a chassis of a ceiling-mounted lighting fixture, and in a state where the chassis is placed on the ceiling, lead wires for power supply to the ballast, wiring for the fixture, etc. No) connection is made.

In this case, the terminal block provided at the end of the ballast case 21
27 and 28 have a configuration in which the lead wire insertion ports 31 are provided on the end faces exposed at both ends in the longitudinal direction of the ballast case 21, so that the lead wires are inserted along the ballast case 21 in the longitudinal direction. The operation of inserting lead wires into this ballast can be performed by an operation of inserting the ballast into the ballast. The arrow in FIG. 1 indicates the insertion direction of the lead wire.

In such wiring work of the lead wires, it is not necessary to attach and detach the case cover 23 of the ballast case 21, so that the work is easy and the mounting work of the equipment can be improved.

By the above-described wiring of the lead wires from the end face direction of the ballast case 21, the insertion end side portion of the lead wires is not wired into the ballast case 21. for that reason,
There is no need to secure a lead wiring space directly below the terminal blocks 27 and 28, and the lead wiring space does not become an element that prevents the ballast case 21 from being thinned.

Then, since the end of the printed wiring board 34 is fixed to the board fixing portion 33 formed on the terminal blocks 27 and 28, the printed wiring board 34 can be supported at an intermediate position in the height direction of the terminal blocks 27 and 28.
That is, the printed wiring board 34 can be provided separately from the main plate portions 22a and 23a of the case body 22 and the case lid 23. The space thus secured between the main plate portions 22a and 23a and the printed wiring board 34 is provided within the height dimension X of the terminal blocks 27 and 28 and attached to the printed wiring board 34. Electrical components 37 and their lead terminals 37
a, It can be used as a space for accommodating the electric component 38, the screw 40, and the like. Therefore, it is not necessary to secure the storage space above or below the terminal blocks 27 and 28, and the storage space does not become an element that prevents the ballast case 21 from being reduced in thickness.

In addition, since the various electric components 37 to 39 are positioned within the height dimension X of the terminal blocks 27 and 28 and mounted on the printed wiring board 34, respectively, the thickness Z of the entire ballast is determined by the height dimension of the terminal blocks 27 and 28. X
The main plate portions 22a, 23a of the case body 22 and the case lid 23
Can be obtained by adding the thickness dimension Y.

Due to the above-described factors, a ballast for an electronic discharge lamp having a small thickness can be obtained. Therefore, this ballast can contribute to a reduction in the thickness of a lighting fixture using the ballast.

Note that the present invention is not limited to the above embodiment. For example, the connection between the case body and the case lid of the ballast case,
The connection between the ballast case and the terminal block, and the connection between the board fixing portion and the printed wiring board may be performed using fixing tools such as screws, and the board fixing portion is not limited to the step portion but is formed by a concave portion. Alternatively, the electrical connection between the printed wiring board and the terminal fittings may be made using lead wires.

[Effects of the Invention] In the ballast for an electronic discharge lamp according to the present invention described above, the terminal provided at the end of the ballast case between the main plates of the case body and the case lid of the case. Since the base has the lead wire insertion ports at the ends exposed at both ends of the ballast case, wiring of the lead wires to the ballast can be easily performed without attaching / detaching the case lid of the ballast case. Work can be done.

In addition to the wiring of the lead wire as described above, the insertion end side portion of the lead wire is not wired in the ballast case, and the end of the printed wiring board is fixed to the board fixing portion formed on the terminal block. The printed wiring board is supported at the middle position in the height direction of the terminal block by fixing the printed circuit board, and the space secured between this board and the main plate of the case body and the case lid is added to the printed wiring board. It can be used as a space for accommodating lead terminals of mounted electrical components, etc.Moreover, various electrical components are located within the height of the terminal block and each is mounted on the printed wiring board, so that the overall thickness of the ballast can be reduced. The height may be a sum of the height of the base and the thickness of each main plate of the case body and the case lid. Therefore, according to the present invention, it is possible to provide a thin electronic ballast.

[Brief description of the drawings]

1 to 3 show one embodiment of the present invention, FIG. 1 is a longitudinal side view, FIG. 2 is a sectional view taken along the line II-II in FIG.
FIG. 3 is an exploded perspective view. 4 and 5 show a conventional example, FIG. 4 is a sectional view, and FIG. 5 is a perspective view. 21 ... ballast case, 22 ... case body, 23 ... case lid, 22a, 23a ... main plate, 22b, 23b ... side plate, 27, 28
…… Terminal block, 31… Lead insertion hole, 32… Terminal fitting, 33… Board fixing part, 34 …… Printed wiring board, 37-
39 ... electric parts, 37a ... lead terminals.

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-60-74304 (JP, A) JP-A-62-241296 (JP, A) JP-A-1-93091 (JP, A) 112622 (JP, U) Japanese Utility Model Showa 56-154024 (JP, U) Japanese Utility Model Showa 57-148800 (JP, U) Japanese Utility Model Utility Model 2-88285 (JP, U) Japanese Utility Model Showa 53-45244 (JP, Y2) Shoko 56-29956 (JP, Y2) Shoko 61-12660 (JP, Y2)

Claims (1)

(57) [Claims] 1. A case main body having side plate portions on both side edges of a main plate portion, and side plate portions respectively on both side edges of the main plate portion, and these side plate portions are overlapped and connected to the side plate portions of the case main body. A case cover, and a cylindrical ballast case having both ends opened by the case body and the case cover, which are respectively disposed between both main plate portions of the case body and the case cover, and A terminal block having a lead wire insertion port at an end exposed at both ends of the container case and a self-locking terminal fitting to which a lead wire inserted through the insertion port is connected; and A substrate fixing portion formed at a portion opposite to the end portion and at an intermediate position in the height direction of the terminal block; and an end portion connected to each of the substrate fixing portions to be bridged between the terminal blocks. And a plug electrically connected to the terminal fitting. A ballast for an electronic discharge lamp, comprising: a lint wiring board; and various electric components mounted within the height dimension of the terminal block and attached to the printed wiring board.